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Why are you not able to see colors emitted by excitation of electrons of the negative...

Why are you not able to see colors emitted by excitation of electrons of the negative ion?

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Answer #1

A color is only visible if it belongs to visible regions of the spectrum that has seven different wavelengths VIBGYOR: Violet, Indigo, Blue, green, yellow, orange and red.

If the given radiation emitted by an excitation of the electron does not belong to visible spectrum then we will not be able to see that particular excitation.
Hence, we can say that radiation emitted by the excitation of an electron in negative does not belong to the visible region, hence not visible.

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